Pressurized cabin e railway track: o que têm em comum

1. Passo 1. Pressurized cabin — faz parte de — Jet airliner. A pressurized cabin.
2. Passo 2. Jet airliner — evoluiu de — Avião. A jet aircraft.
3. Passo 3. Avião — inclui — Wright Flyer. The first aeroplane.
4. Passo 4. Wright Flyer — utiliza — Railway track. The Flyer had no wheels: it took off along a wooden rail.

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